CN201557283U - LED energy-saving lamp with open-circuit protection - Google Patents
LED energy-saving lamp with open-circuit protection Download PDFInfo
- Publication number
- CN201557283U CN201557283U CN2009202027164U CN200920202716U CN201557283U CN 201557283 U CN201557283 U CN 201557283U CN 2009202027164 U CN2009202027164 U CN 2009202027164U CN 200920202716 U CN200920202716 U CN 200920202716U CN 201557283 U CN201557283 U CN 201557283U
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- circuit
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- triode
- resistance
- series
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
An LED energy-saving lamp with open-circuit protection comprises an LED series circuit which is composed of a plurality of LEDs connected in series, wherein the LED series circuit is divided into a plurality of LED branch lines, each LED branch line is composed of a plurality of LEDs connected in series, each LED branch line is respectively connected in parallel with a voltage stabilizing circuit, and a constant current circuit or a current-limiting circuit is further connected in series in the LED series circuit. When one group of LEDs are damaged, each voltage stabilizing circuit is connected in series on an LED lighting circuit, thereby guaranteeing that the entire LED circuit can still work, and the normal work of the LED energy-saving lamp cannot be affected due to faults of a certain group of LEDs. The rational working current of LEDs can be adjusted through the constant current (current-limiting) circuit, which enables the LEDs to always work in the rational working current. The LED energy-saving lamp ensures normal luminescence and effectively enhances performances of LED energy-saving lamps and service life of LEDs.
Description
Technical field
The utility model relates to a kind of LED electricity-saving lamp, relates in particular to the open loop protection circuit of LED electricity-saving lamp, is applicable to civilian, road, tunnel, bridge, and industrial lighting.
Background technology
The LED electricity-saving lamp is a kind of lighting of environmental protection and energy saving, make an operating voltage 3.0-3.2V, and electric current 18-20mA, the LED miniature bulb of power 0.06W be when illumination usefulness, must be a plurality of in parallel the or series connection of LED use, just reach need illuminating effect.Because LED parallel technology difficulty is big, the cost height so take series connection to use mostly, comprises led circuit that is composed in series by a plurality of LED (light-emitting diode) and the DC power supply that the led circuit operate as normal is provided.For LED is worked under stable voltage status, need to give led circuit voltage stabilizing circuit in parallel, voltage stabilizing circuit generally adopts voltage stabilizing didoe.Because led circuit is composed in series by a plurality of LED, when one of them LED damages open circuit, can cause the whole LED open circuit, influence the normal illumination of LED electricity-saving lamp.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of LED energy-saving lamp circuit, and this LED energy-saving lamp circuit can prevent to influence the luminous of series connection other LED together when certain LED damages open circuit, to overcome the defective that existing LED energy-saving lamp circuit exists.
The technical solution of the utility model is: a kind of LED electricity-saving lamp, comprise the LED series circuit that is composed in series by a plurality of LED, described LED series circuit is divided into several LED branch roads, and each LED props up several LED of route and is in series, each LED branch road voltage stabilizing circuit respectively in parallel.
The further technical scheme of the utility model is: also connect in the described LED series circuit current stabilization circuit or current-limiting circuit.
The beneficial effects of the utility model are: 1, the LED series circuit is carried out segmentation and connects voltage stabilizing circuit, when a certain group of LED damages, because each voltage stabilizing circuit series connection is arranged on the LED lighting circuit, thereby guarantee whole LED circuit endure, can not organize the operate as normal of the fault effects LED electricity-saving lamp of LED because of certain.2, because in led circuit, also connect a current stabilization circuit or current-limiting circuit, when the LED operating current is unstable or too high, regulate the reasonable operating current of LED by current stabilization (current limliting) circuit, LED is reasonably being worked in the operating current all the time, guarantee normally luminously, effectively improve the performance of LED electricity-saving lamp and the useful life of LED.
The utility model is described in further detail below in conjunction with the drawings and the specific embodiments.
Description of drawings
Fig. 1 is the circuit block diagram of the utility model embodiment;
Fig. 2 is the circuit theory diagrams of first embodiment of the utility model current stabilization circuit;
Fig. 3 is the circuit theory diagrams of second embodiment of the utility model current stabilization circuit.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, embodiment of the present utility model is a kind of LED energy-saving lamp circuit with voltage stabilization and current stabilization function, comprise rectification circuit, filter circuit, LED series circuit, current stabilization circuit and voltage stabilizing circuit, current stabilization circuit is connected in the work loop of LED series circuit.
Rectification circuit adopts full-bridge rectifier D81, and wherein two terminals connect alternating current, and alternating current is converted to direct current, and two ends are respectively the positive terminal of output dc voltage and negative pole end (hold) in addition.
Filter circuit can adopt capacitor filtering, choke filtering, electronic filtering etc., the filtering alternating current component, and filtered smooth direct current power supply offers the work of LED series circuit.For the low cost design, present embodiment is taked capacitor filtering, comprises filter capacitor C1, and filter capacitor C1 is connected in parallel on the output of full-bridge rectifier D81.
The LED lighting circuit is composed in series by a plurality of LED, LED quantity can be set according to the actual illumination needs, be equally divided into D1-DN LED branch road series connection (annotate: N represents positive integer) together, each branch road D1-DN of present embodiment is composed in series by 8 LED respectively, the voltage stabilizing circuit that each branch road voltage stabilizing didoe DW1-DWN in parallel respectively forms, each voltage stabilizing didoe DW1-DWN both positive and negative polarity successively is connected in series together end to end, is connected in parallel on the positive and negative two ends of whole LED series circuit.Owing to direct voltage along with the fluctuation of alternating current is fluctuateed, offer the LED work of each with it in parallel LED branch road D1-DN after voltage stabilizing didoe DW1-DWN dividing potential drop through being cascaded and the voltage stabilizing respectively, make the LED of each LED branch road obtain stable voltage.The positive terminal of LED series circuit, the positive pole that is the first LED of LED series circuit is connected with the positive terminal of the output dc voltage of rectification circuit D81, obtain direct-current working volts, the negative pole of end the LED of LED series circuit is connected formation LED lighting circuit through the negative pole end of current stabilization circuit and the output dc voltage of rectification circuit D81 (hold).Because the characteristic of voltage stabilizing didoe DW1-DWN serial connection plays the open-circuit-protection effect to LED, promptly when a certain paths of LEDs pipe damage, other paths of LEDs pipe still can operate as normal.
As shown in Figure 2, current stabilization circuit comprises the first triode Q1, the second triode Q2, the 3rd resistance R 3 and the 4th resistance R 4; The collector electrode of the first triode Q1 is connected with the base stage of the second triode Q2 and is connected with the positive terminal of rectification circuit D81 output dc voltage; The negative pole of one end of the collector electrode of the second triode Q2 and the 3rd resistance R 3 and the last LED of LED series circuit is connected; The emitter of the second triode Q2 is connected with the base stage of the first triode Q1 and is connected with an end of the 3rd resistance R 3 other ends and the 4th resistance R 4, and the 4th resistance R 4 other ends are connected with the negative pole end of rectification circuit D81 output dc voltage.For improving the job stability of current stabilization circuit, as shown in Figure 3, the base stage of the described second triode Q2 is by being connected with the positive terminal of rectification circuit output dc voltage with the bleeder circuit that the first voltage stabilizing didoe D82 forms by first resistance R 1; The emitter of the described first triode Q1 connects an end of the 5th resistance R 5 and second capacitor C, 2 parallel circuitss, the other end of second capacitor C 2 and the 5th resistance R 5 parallel circuitss and rectification circuit D81 output dc voltage negative pole end be connected; Described current stabilization circuit comprises that also the collector electrode of second resistance R, 2, the second triode Q2 is connected with the negative pole of the last LED of the 3rd resistance R 3 one ends and LED series circuit by second resistance R 2; The collector electrode of the described second triode Q2 also connects the second voltage stabilizing didoe D92, the second voltage stabilizing didoe D92 other end and rectification circuit D81 output dc voltage negative pole end be connected.
When the LED heating current increases, cause the electric current between the 3rd resistance R 3 and the 4th resistance R 4 to rise, just the base voltage of the first triode Q1 rises, and rises to the to a certain degree collector and emitter conducting of the first triode Q1; The first triode Q1 conducting causes the base voltage of the second triode Q2 to descend, the base voltage of the second triode Q2 descends, the collector and emitter conducting meeting of the second triode Q2 reduces, just the collector and emitter resistance of the second triode Q2 strengthens, cause current-limiting resistance to strengthen, current-limiting resistance strengthens restriction LED operating current and rises; When the LED electric current is less than normal, electric current between the 3rd resistance R 3 and the 4th resistance R 4 descends, just the base voltage of the first triode Q1 descends, dropping to a certain degree, the collector and emitter of the first triode Q1 ends, the first triode Q1 rises by the base voltage that causes the second triode Q2, the base voltage of the second triode Q2 rises, the collector and emitter conducting of the second triode Q2 increases, just the collector and emitter resistance of the second triode Q2 reduces, cause current-limiting resistance to reduce, the first triode Q1 like this, the work that the second triode Q2 goes round and begins again is limited in rational area of safety operaton to the operating current of LED.
Claims (10)
1. LED electricity-saving lamp with open-circuit-protection; comprise the LED series circuit that is composed in series by a plurality of LED; it is characterized in that: described LED series circuit is divided into several LED branch roads, and each LED props up several LED of route and is in series, each LED branch road voltage stabilizing circuit respectively in parallel.
2. the LED electricity-saving lamp with open-circuit-protection according to claim 1 is characterized in that: described LED series circuit is divided into several LED branch roads, and each LED props up the equal LED of route quantity and is in series.
3. the LED electricity-saving lamp with open-circuit-protection according to claim 1 and 2, it is characterized in that: described voltage stabilizing circuit comprises voltage stabilizing didoe, described voltage stabilizing didoe is in parallel with the LED branch road.
4. the LED electricity-saving lamp with open-circuit-protection according to claim 1 and 2 is characterized in that: also connect in the described LED series circuit current stabilization circuit or current-limiting circuit.
5. the LED electricity-saving lamp with open-circuit-protection according to claim 3 is characterized in that: also connect in the described LED series circuit current stabilization circuit or current-limiting circuit.
6. according to the described LED electricity-saving lamp with open-circuit-protection of claim 4, it is characterized in that: described current stabilization circuit comprises first triode (Q1), second triode (Q2), the 3rd resistance (R3) and the 4th resistance (R4); The collector electrode of first triode (Q1) is connected with the base stage of second triode (Q2) and is connected with the positive terminal of rectification circuit (D81) output dc voltage; The negative pole of one end of the collector electrode of second triode (Q2) and the 3rd resistance (R3) and the last LED of LED series circuit is connected; The emitter of second triode (Q2) is connected with the base stage of first triode (Q1) and is connected with an end of the 3rd resistance (R3) other end and the 4th resistance (R4), and the 4th resistance (R4) other end is connected with the negative pole end of rectification circuit (D81) output dc voltage.
7. according to the described LED electricity-saving lamp with open-circuit-protection of claim 5, it is characterized in that: described current stabilization circuit comprises first triode (Q1), second triode (Q2), the 3rd resistance (R3) and the 4th resistance (R4); The collector electrode of first triode (Q1) is connected with the base stage of second triode (Q2) and is connected with the positive terminal of rectification circuit (D81) output dc voltage; The negative pole of one end of the collector electrode of second triode (Q2) and the 3rd resistance (R3) and the last LED of LED series circuit is connected; The emitter of second triode (Q2) is connected with the base stage of first triode (Q1) and is connected with an end of the 3rd resistance (R3) other end and the 4th resistance (R4), and the 4th resistance (R4) other end is connected with the negative pole end of rectification circuit (D81) output dc voltage.
8. according to the described LED electricity-saving lamp of claim 7 with open-circuit-protection; it is characterized in that: described current stabilization circuit also comprises second resistance (R2), and the collector electrode of second triode (Q2) is connected with the negative pole of the last LED of the 3rd resistance (R3) end and LED series circuit by second resistance (R2).
9. described LED electricity-saving lamp according to Claim 8 with open-circuit-protection; it is characterized in that: the base stage of described second triode (Q2) is connected with the positive terminal of rectification circuit output dc voltage by the bleeder circuit of being made up of first resistance (R1) and first voltage stabilizing didoe (D82); the emitter of described first triode (Q1) connects an end of the 5th resistance (R5) and second electric capacity (C2) parallel circuits, the other end of second electric capacity (C2) and the 5th resistance (R5) parallel circuits and rectification circuit (D81) output dc voltage negative pole end be connected.
10. according to the described LED electricity-saving lamp of claim 9 with open-circuit-protection; it is characterized in that: the collector electrode of described second triode (Q2) also connects second voltage stabilizing didoe (D92), second voltage stabilizing didoe (D92) other end and rectification circuit (D81) output dc voltage negative pole end be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202027164U CN201557283U (en) | 2009-12-14 | 2009-12-14 | LED energy-saving lamp with open-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202027164U CN201557283U (en) | 2009-12-14 | 2009-12-14 | LED energy-saving lamp with open-circuit protection |
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| Publication Number | Publication Date |
|---|---|
| CN201557283U true CN201557283U (en) | 2010-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202027164U Expired - Fee Related CN201557283U (en) | 2009-12-14 | 2009-12-14 | LED energy-saving lamp with open-circuit protection |
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| CN (1) | CN201557283U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124860A (en) * | 2013-04-23 | 2014-10-29 | 深圳市海洋王照明工程有限公司 | Switching-power-supply protective circuit and LED light fixture |
-
2009
- 2009-12-14 CN CN2009202027164U patent/CN201557283U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124860A (en) * | 2013-04-23 | 2014-10-29 | 深圳市海洋王照明工程有限公司 | Switching-power-supply protective circuit and LED light fixture |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20131214 |